Troubleshooting guide

46
www.bendix.com 1-800-AIR-BRAKE (1-800-247-2725)
Pre-Trip Safety Inspections
The Bendix
®
BVA-85
™
brake valve actuator
enables pre-trip brake inspections safely and
easily with only one person. It uses air from
the trailer supply of the Bendix
®
MV-3
™
valve
to keep the foot pedal applied at an accurate
85 psi service brake application.
BVA-85
™
Brake
Valve Actuator
This valve is also used as a work brake for
unique systems, e.g. to apply the service
brakes for door interlock systems for transit
and school bus applications, refuse interlock
systems, and other severe service vehicle
interlock systems including paving and
construction.
Miscellaneous Systems and Components (continued)
Fan Clutches
Fan clutches are air-operated, normally engaged,
on-off clutches that control the engine cooling fan.
The fan clutch senses the engine coolant
temperature and maintains engine temperature by
engaging or disengaging the cooling fan. Using a
fan clutch helps conserve fuel and engine efficiency,
and it leads to faster warm-ups and a quieter
vehicle. Bendix recommends snap-action
electronic fan clutch controls for both performance
and reliability.
The FD-L
™
and FD-3
™
fan clutches are designed to
be fail safe. Both models feature spring engagement
and air disengagement.
Most later model vehicle/engine combinations are
available in kit form and contain all the necessary
parts for installation. Control kits are also available,
including those for shutter-equipped and air-
conditioned vehicles.
FD-l
™
Fan Clutch
FD-3
™
Fan
Clutch
Caution: Fan bolts must not
enter the fan plate more than
½" or less than
3
/
8
".
Electronic Throttles
The ET-S
™
and ET-S2
™
electronic throttles
are installed on vehicles with electronically
controlled, fuel management systems on newer
diesel engines. The electronic throttle replaces
the mechanical accelerator pedal and linkage found
on conventional diesel engine, fuel management
systems. It provides graduated throttle control by
communicating with the Electronic Control Module
(ECM) controlling the engine.
ET-S2
™
Electronic
Throttle
ET-S
™
Electronic
Throttle